Best would be a PTW. Work a couple compressed work week rotos in the sands and you should have enough for a couple PTW's (at least that's my goal for next summer).

Other than that; G&P and VFC for AR based rifles and Real Sword, or LCT for AK based. Accept no substitute. If you want a GBBR the KWA/KSC's aren't too bad and I kind of like them, KJW's are gameable out of the box, while WE's will need a lot of work gutting and replacing with RA-Tech components.